CN1739070A - Digital watch with solar cell - Google Patents

Abstract

The electronic watch with solar cell of the invention, have watch movement, take in watch case of movement of the table, use for take in keep watch movement in watch case of above-mentioned centre hoop, solar cell and dial; wherein the solar cell is a long and thin strip-shaped solar cell formed on a flexible circuit board, while forming a structure in which the solar cell is arranged substantially vertically at a positioning portion of the solar cell provided in the center band; thus, since the solar cell can be completed without disposing it on the watch movement, even if the outer diameter is changed, the center band as the exterior member can be changed, and a common watch movement can be used. In addition, since the solar cell can be wound in a ring shape corresponding to the size of the middle band when the solar cell is assembled into the middle band, a common solar cell can be used even if the outer diameter size of the watch is changed.

Description

Digital watch with solar cell

technical field

The present invention relates to a watch with a solar power generation system for generating electricity using light and a charging system for charging the power generated by the solar power generation system, in which a solar cell is arranged on a backing. surface.

Background technique

Currently, many electronic watches that have solar cells and utilize light such as sunlight as a power source for power generation have been commercialized. In these electronic watches, the solar cells are placed under the translucent dial, which restricts the appearance design of the dial. As a result, it is impossible to propose a variety of products from the perspective of appearance design.

That is to say, since the surface of the solar cell is dark brown, in order to cover the color of the surface, the code disc needs to be placed on the solar cell. On the other hand, since the solar cell needs to generate electricity after being exposed to light, it is necessary for the code disc to have a certain degree of light transmittance. Therefore, even if the color of the code wheel is made white, the code wheel will be formed with a gray tone like frosted glass, and the clean white cannot be displayed, thereby restricting the appearance design.

However, in recent years, as the power consumption of watches has decreased, even if the area of the solar cell is reduced to a certain extent, the watch can still be operated. Therefore, an electronic watch with a solar cell has been proposed in which a solar cell is arranged on the outer periphery of a dial in a state substantially perpendicular to the dial. As an existing example of this type, Japanese Patent Publication No. 62-42390 (Patent Document 1) or Japanese Patent Laid-Open No. 2002-148366 (Patent Document 2) have been disclosed. The electronic watch with a solar cell disclosed is The solar cell formed on the flexible belt-shaped printed circuit board is wound on the wall surface of the gap between the windshield glass and the dial.

17 to 20 are examples described in Patent Document 1, the first example is shown in FIGS. 17 and 18 , and the second example is shown in FIGS. 19 and 20 .

In the solar cell assembly 121 shown in Figure 18, a plurality of solar cell blocks 123 are installed on a flexible printed circuit board 122, and at the same time, these solar cell blocks 123 are connected through electrode patterns, and a device for filling the space between the solar cell blocks 123 is provided. The spacer 124 of the gap. The solar battery module 121 is bonded to the support ring 125 through a flexible printed circuit board.

FIG. 18 is a cross-sectional view of a watch in a state where the solar cell module 121 shown in FIG. 19 is assembled into a watch case 127 . In the solar cell module 121 , the surface of the solar cell block 123 is vertically facing the center of the table relative to the dial 126 . The solar cell module 121 has a structure pasted on the support ring 125 .

In a solar cell module 131 shown in FIG. 21, a solar cell block 133 made of amorphous silicon is formed on a thin stainless steel plate 132 with an insulating film applied thereto. The plurality of solar battery blocks 133 are connected by positive and negative electrodes 134 a , 134 b arranged at both ends of the stainless steel thin plate 132 and a wiring pattern 135 .

FIG. 20 is a cross-sectional view of a wristwatch in a state where the solar cell module 131 shown in FIG. 21 is assembled into a watch case 136. As shown in FIG. The solar cell module 131 made of a flexible stainless steel sheet is wound inside the inner wall surface 137 of the watch case 136, and the solar cell module 131 is arranged so that the solar cell block 133 faces the center of the watch upright relative to the dial 138.

22 and 23 are drawings of the first embodiment described in Patent Document 2. FIG.

FIG. 22 is a plan view of an elongated strip-shaped solar cell 141 formed on a flexible circuit board 140; positive and negative electrodes 147a, 147b are arranged at both ends of the solar cell 141.

FIG. 23 is a cross-sectional view of a state where the solar cell 141 is assembled in the watch case 146 . The solar cell 141 in FIG. 23 is a D-D cross-sectional view of FIG. 22 , showing the position where the positive and negative electrodes 147 a ( 147 b ) of the solar cell 141 are in contact with the connection spring 148 . The solar battery 141 is located above the arrangement surface 142a of the dial 143 of the watch movement 142 and is arranged on the inner peripheral surface 144a of the annular stop ring 144 along the outer periphery of the watch movement 142 . The solar cell 141 is mounted inside a case 146 with a translucent back ring 145 arranged inside.

However, in the structure of the first embodiment of Patent Document 1 shown in FIG. 18 , a plurality of solar cell blocks 123 are arranged in a circumferential shape and electrically connected in series, and have a constant length. Therefore, in a watch with a small outer diameter, if the same solar cell module 121 as in this embodiment is mounted, the solar cell blocks 123 overlap each other, resulting in solar cell blocks 123 that are not exposed to light. However, the solar battery module 121 has a problem in that the output power of the solar battery block 123 that is not exposed to light cannot obtain the power necessary to define the overall output power.

Similarly, in the second embodiment of Patent Document 1 shown in FIG. 20 , solar cell blocks 133 are also connected in series, so there is the same problem as that of the first embodiment of Patent Document 1 shown in FIG. 18 .

In addition, since the solar cell module 131 of the second embodiment of Patent Document 1 is provided with the positive and negative electrodes 134a and 134b for taking out generated electric power at both ends, if it is used for a watch with a small outer diameter, the positive and negative electrodes 134a , 134b overlapping can not take out the power problem.

Similarly, in the first embodiment of Patent Document 2 shown in FIG. 22 and FIG. 23, the positive and negative electrodes 147a, 147b for taking out generated electric power are also provided at both ends thereof, so there is a difference with the second embodiment of Patent Document 1.

Example same problem.

In addition, the so-called outer diameter refers to the diameter of the planar shape of the space in which the hour, minute, and second hands are sandwiched between the dial and the windshield; The inside diameter of the backing ring.

Furthermore, in the structure of the first embodiment of Patent Document 2, the annular stop ring 144 on which the solar cell 141 is arranged is formed on the watch movement part, so when changing the outer diameter, there is a problem that the watch movement part on which the solar cell is arranged must be changed. question.

In addition, for watches with a small outer diameter, a method of increasing the width W of the back ring 145 by only reducing the inner diameter of the back ring 145 has also been considered, but the outer diameter of the case 146 is larger than the outer diameter of the watch. , there will be design problems.

As mentioned above, in the prior art, because the solar cell and the watch movement part equipped with the solar cell cannot be used together in a watch with a different outer diameter, there is a possibility that the solar cell or the solar cell module corresponding to the outer diameter must be remade. And the question of the watch movement parts that configure them.

Therefore, it is an object of the present invention to provide a wristband that can use a common solar cell and watch movement structure regardless of the outer diameter in an electronic watch with a solar cell that is arranged approximately vertically with respect to the dial. Electronic watch with solar cell.

content of the invention

The electronic watch with a solar cell of the present invention is provided with a watch movement, a watch case for accommodating the watch movement, a middle hoop for storing and maintaining the watch movement in the watch case, a solar cell, and a dial, And the above-mentioned solar cell is arranged approximately vertically with respect to the above-mentioned code plate; wherein, the above-mentioned solar cell is arranged at the solar cell positioning part provided in the above-mentioned middle hoop.

In this way, it can be completed without arranging the solar cell on the watch movement, so even if the size of the outer diameter is changed, it is only necessary to change the middle ring as the exterior part, so that a common watch movement can be used.

In addition, in the present invention, the solar cell is an elongated ribbon-shaped solar cell formed on a flexible wiring board.

In this way, if the solar cell is made into an elongated strip shape, since the solar cell can be rolled into a ring shape corresponding to the size of the middle ring when the solar cell is assembled into the middle ring, it can be used even if the outer diameter of the watch is changed. common solar cells.

In addition, in the present invention, the positive and negative electrodes of the solar cell are disposed on the same side end of the solar cell.

If the positive and negative electrodes are arranged at both ends of the solar cell as in the past, the relative positions of the positive and negative electrodes will change when the outer diameter of the watch is different. However, if the above-mentioned positive and negative electrodes are arranged on the same end of the solar cell as in the present invention, the relative position between the positive and negative electrodes does not change even if the size of the outer diameter changes. Therefore, there is no need to change the connection structure between the positive and negative electrodes of the solar cell and the watch movement, and both men's watches and women's watches can use a common watch movement.

In the present invention, a lead-out electrode for extracting electric power generated by the solar cell and the solar cell are manufactured and joined separately.

Thereby, the shapes of the lead-out electrodes and the solar cell can be simplified, and manufacturing can be facilitated, thereby reducing processing costs. In addition, when the external shape of the watch changes greatly, a common solar cell can be used only by changing the length (or shape) of the lead-out electrodes.

In addition, the present invention is configured such that the above-mentioned code disk is a code disk having corners for connecting multiple sides forming the main peripheral shape and intersection points between the multiple sides; the above-mentioned solar cell has a The multiple sides of the above-mentioned code wheel and the plurality of photoelectric power generation parts arranged approximately perpendicular to the above-mentioned code wheel are connected in parallel.

In this case, since it is not necessary to arrange solar cells composed of photovoltaic parts (photoelectric power generation regions) made of very brittle materials at the corners of the dial, it is not necessary to bend the photovoltaic power generation parts with a small radius, and it is possible to form Arbitrary code wheel shape. In addition, since an electronic watch with a solar cell can be constituted by preparing only one strip-shaped solar cell having a plurality of photovoltaic power generation parts, it is possible to achieve simple structure, Reduce costs.

In addition, the photovoltaic power generation unit can be configured by arranging a plurality of amorphous silicon layers in the width direction of the circuit board and connecting them in series.

In addition, in the present invention, the outer peripheral shape of the above-mentioned code disc formed by the above-mentioned multiple sides and corners is rectangular or barrel-shaped.

Thus, a dial having a rectangular or barrel-shaped outer periphery can be used, thereby enriching the appearance design of the electronic watch with solar cells.

A brief description of the drawings

Fig. 1 is a plan view of a completed solar cell according to an embodiment of the present invention.

Fig. 2 is a plan view of a solar cell according to an embodiment of the present invention.

Fig. 3 is a plan view of an extraction electrode according to an embodiment of the present invention.

Fig. 4 is a perspective view showing a state in which a completed solar cell according to an embodiment of the present invention is assembled in a middle band of a men's watch with a large outer diameter.

Fig. 5 is a perspective view showing a state in which a completed solar cell according to an embodiment of the present invention is assembled in a middle band of a ladies' watch with a small outer diameter.

Fig. 6 is a sectional view of main parts showing a men's electronic watch with a solar cell according to an embodiment of the present invention.

FIG. 7 is a plan view showing a state in which the watch movement of the electronic watch with solar cells shown in FIG. 6 is inserted into the center band.

Fig. 8 is a cross-sectional view of main parts showing a ladies' electronic watch with a solar cell according to an embodiment of the present invention.

Fig. 9 is a graph of obtained current and light-receiving efficiency measured with respect to the outer diameter of the electronic watch with solar cell according to the embodiment of the present invention.

Fig. 10 is another embodiment of the electronic watch with a solar cell according to the present invention, and is a plan view showing a state in which the watch movement is assembled in the center ring.

Fig. 11 is another embodiment of the electronic watch with a solar cell according to the present invention, and is a plan view showing a state in which the watch movement is assembled in the middle ring.

Fig. 12 is a plan view showing an electronic watch with a solar cell according to another embodiment of the present invention.

Fig. 13 is a sectional view along line A-A of Fig. 12 .

Fig. 14 is a plan view of a planar solar cell in which the completed solar cell shown in Fig. 12 is developed.

Fig. 15 is a B-B sectional view of the completed solar cell shown in Fig. 14 .

FIG. 16 is a C-C sectional view of the completed solar cell shown in FIG. 14 .

17 is a plan view of a completed solar cell showing a state of electrical connection of a plurality of amorphous silicon layers in a completed solar cell according to another embodiment.

FIG. 18 is a sectional view of main parts showing a solar battery watch according to a first embodiment described in Patent Document 1. FIG.

19 is a cross-sectional view of main parts showing a solar cell module according to a first embodiment described in Patent Document 1. FIG.

FIG. 20 is a sectional view of main parts showing a solar battery watch according to a second embodiment described in Patent Document 1. FIG.

FIG. 21 is a plan view showing a solar cell module according to a second embodiment described in Patent Document 1. FIG.

FIG. 22 is a plan view of a solar cell body according to a first embodiment described in Patent Document 2. FIG.

23 is a cross-sectional view of an electronic watch with a solar cell according to a first embodiment described in Patent Document 2. FIG.

The best form for carrying out the invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to this embodiment.

First, the structure of the solar cell according to the embodiment will be described.

FIG. 1 is a plan view of a completed solar cell 1, showing a state in which a solar cell 2 and a lead electrode 4 are integrated by thermocompression bonding.

Fig. 2 is a plan view of a solar cell. The solar cell 2 is a solar cell in which elongated strip-shaped single cells such as an amorphous silicon layer are formed on a circuit substrate 3 made of a PET film. Positive and negative electrodes 2b and 2c are arranged in parallel on the same end portion on the back side of the power generating region 2a.

The outer shape of the solar cell 2 is an elongated strip with a length of about 96.8 mm, a width of 2.4 mm, and a thickness of about 0.15 mm. The size of the photovoltaic power generation region 2 a is about 92.1 mm and a width of 1.6 mm. On the entire periphery of the photovoltaic power generation region 2a, there is an edge portion 2d with a width of about 0.4m that does not generate electricity when exposed to light, which is cut and separated into solar cells one by one from a sheet on which a plurality of solar cells are formed on a large PET film. When the cutting margin.

FIG. 3 is a plan view of the extraction electrode 4 . The lead-out electrode 4 is formed with positive and negative electrodes 4c and 4d on a flexible printed circuit board with a total thickness of about 0.1mm. An anisotropic conductive adhesive is coated on the junction surface 4a of the lead-out electrode 4 that is joined to the solar cell 2, and after the positive and negative electrodes 4c, 4d of the solar cell 2 are aligned with the junction electrodes 4e, 4f of the lead-out electrode 4, Bonded by thermocompression bonding, the solar cell 1 is completed.

The lead-out electrode 4 is provided with a long hole 4b for adjusting the installation position, and the two sides of the long hole 4b are provided with elongated positive and negative output electrode patterns 4c, 4d, through which the lead-out electrode 4 and the table circuit board are not shown. Connected, the power generated by the completed solar cell 1 is supplied to the meter circuit board.

FIG. 4 is a perspective view of the completed solar cell 1 when assembled into the watch case. The completed solar cell 1 is assembled in the watch as shown in FIG.

The portion of the positive and negative electrodes 2b and 2c of the solar cell 2 cannot be arranged with the photovoltaic region 2a. Therefore, the winding method of the solar cell 1 is completed in order to expand the power generation area. The position where the lead-out electrode 4 is attached can be on the outside, and the other end 2e of the positive and negative electrodes 2b and 2c of the solar cell 2 is not arranged on the inside. Ring method. In addition, 1 indicates an overlapping portion of the solar cell 2 .

FIG. 5 is a perspective view of a completed solar cell showing a wound state of the solar cell when a completed solar cell 1 having the same length as that of FIG. around the diameter, so the overlapping part 1 of the solar cell becomes wider.

Next, an embodiment of the electronic watch with a solar cell of the present invention will be described.

6 is a sectional view of an electronic watch with a solar cell according to an embodiment of the present invention, showing a sectional view of main parts of a men's watch with an outer diameter of φ28 mm.

The movement 5 of the watch is embedded in the ring-shaped middle hoop 9, and after the dial 7 and the hour, minute and second hand 8 are installed, the light-transmitting lining ring 10 is installed at the outer peripheral edge 7a of the dial, and assembled into the watch case 6 Inside. The completed solar cell 1 is pre-packed in the middle hoop 9 .

In addition, the middle ring 9 is an exterior part for storing and maintaining the watch movement 5 in the watch case 6 when the watch movement 5 is installed in the watch case 6, or absorbing the impact from the outside of the watch. Case 6 is produced in several varieties.

An annular stepped portion 9a as a positioning portion for the solar cell 1 is formed in the middle hoop 9, and the completed solar cell 1 is accommodated in the annular stepped portion 9a, and at the same time, the completed annular solar cell 1 is wound around the circle. The completed solar cell 1 formed later is placed on the inner peripheral surface 9b of the stepped portion 9a under tension, or is attached to the inner peripheral surface 9b of the stepped portion 9a by bonding or the like.

In addition, the lead-out electrode 4 of the solar cell 1 is protruded from the hole 9c provided in the middle hoop 9 to the rear cover 16 side, and the screw is threaded through the long hole 4b of the lead-out electrode 4 through the insulating thin plate 13 and the fastening plate 14. 12, fixed on the positioning sleeve 15. In addition, in the case shown in this embodiment, the position of the positioning sleeve 15 arranged at the center ring 9 is set to be 10.45 mm away from the movement of the watch. Thus, the electrical connection between the solar cell 1 and the circuit board 11 is completed.

FIG. 7 is a top view of the electronic watch with solar cells, showing a state in which the watch movement 5 is housed in the ring-shaped middle band 9 in which the solar cells 1 have been assembled. In addition, FIG. 7 shows a state in which the lead-out electrode 4 protruding from the hole 9c of the inner ferrule 9 is fixed to a circuit board (not shown) by the screw 12 through the above-mentioned fastening plate 14 or the like.

8 is a sectional view of an electronic watch with a solar cell, showing a sectional view of main parts of a women's watch with an outer diameter of 24 mm. The outer diameter becomes smaller than that shown in FIG. 6 , but the solar cell 1 and watch movement 5 are completed using the same parts as those shown in FIG. 6 . In this embodiment, the position of the positioning sleeve 15 of the lead-out electrode 4 of the completed solar cell 1 fixedly arranged on the middle ring 9w is 10.45 mm from the movement of the watch, which is similar to the men's watch with an outer diameter of φ28 mm shown in FIG. Compared with the situation, there is no change.

In addition, except for the case 6w, dial 7w, ring 10w, etc., which are the outer parts, the middle ring 9w for holding the watch movement 5 in the case 6w corresponds to the size of the case, and the size in the diameter direction is smaller than that in the figure. 6 parts.

The finished solar cell 1 for women's watches is the same as that of men's watches. When the outer diameter becomes smaller, the same finished solar cell can be used in common by increasing the length of the overlapping portion 1 of the finished solar cell 1 as shown in FIG. 5 . battery1.

In addition, the distance L between the solar cell 1 and the positioning sleeve 15 is smaller for women's watches than for men's watches, but because the hole 4b for fixing the lead-out electrode 4 is in the shape of a long hole, and the two sides of the long hole 4b are connected to each other. The elongated positive and negative output electrode patterns 4c, 4d of the positive and negative output electrodes of the solar cell 2, so even if the distance L between the solar cell 1 and the positioning sleeve 15 changes, the same lead-out electrode 4 can be used together within a certain range .

From the above, no matter men's watches or women's watches can use a common solar cell 2 and lead-out electrodes 4 , so they can use a common finished solar cell 1 .

As mentioned above, in order to obtain a rich variety of watch designs, generally a plurality of exterior designs are prepared for one watch movement, that is, corresponding to watches using the same watch movement but with different designs and sizes, designed and produced as exterior designs. Parts of the watch case, code disc, pointer, middle hoop, etc. Therefore, as shown in the present invention, there is no problem in preparing a plurality of ferrules for each size of the exterior member for arranging solar cells corresponding to designs different in outer diameter.

In addition, compared with the components in FIG. 6 , the distance L between the completed solar cell 1 and the positioning sleeve 15 is small, so the lead-out electrode end 4g is close to the center of the watch movement 5 . Therefore, a short circuit may occur due to contact between the unillustrated connection pattern of the extraction electrode and the metal circuit support plate 17 . Therefore, an insulating thin plate 18 is disposed between the lead-out electrode 4 and the circuit support plate 17 as a measure to prevent this.

In addition, there is an air layer 10a between the backing ring 10 and the completed solar cell 1 , and the light passing through the backing ring 10 is reflected at the interface to generate refraction or scattering, so that the dark brown color of the solar cell 2 is not easy to be seen from the outside.

In addition, the back ring 10 is produced by injection molding of a light-transmitting colorless transparent polycarbonate resin, and its surface state is a glossy surface.

Next, the power generation operation of the electronic watch with a solar cell according to this embodiment will be described with reference to FIG. 6 .

To the incidence of light to complete the solar cell 1, there is a case where the light 20 passing through the windshield 19 directly passes through the light-transmitting lining ring 10, and the light 20 passing through the windshield 19 is reflected at the dial 7, Or further, it is reflected on the lower surface of the windshield 19 and transmitted through the translucent backing ring 10 . In this way, light G is incident on the completed solar cell 1 to generate power. The electric power generated by the solar battery 1 is charged to a secondary battery (not shown) through a boost control circuit (not shown) and a charging circuit (not shown) mounted and formed on the circuit board 11 in the watch movement 5 . The watch is driven by electric power from a secondary battery.

Next, the relationship between the size of the outer diameter and the amount of power generation will be described.

In this embodiment, the outside diameter of the watch shown in FIG. 8 is smaller than that of the watch shown in FIG. 6, so a region where repeated power generation cannot be generated occurs in a part of the solar cell 2. However, since the solar cell 2 is a single cell, it is different from the conventional example in which a plurality of solar cells are connected in series in the circumferential direction, and the amount of power generation corresponding to the light-receiving area can be obtained.

Fig. 9 is the coordinates after measuring the power generation performance of the completed solar cell 1 when the structure shown in Fig. 6 is assembled in a watch case with a changed outer diameter under an illuminance of 500 lux, and measuring the obtained current and light-receiving efficiency with respect to the outer diameter picture.

In addition, the so-called obtained current is the generated current in the state where a constant illuminance light from the vertical direction is irradiated with respect to the dial on the completed watch with the completed solar cell 1 installed, and is when the operating voltage of the completed solar cell 1 is set to 0.45 V. Measured under the condition that the color of the code disc is black.

In addition, the so-called light-receiving efficiency is relative to the power generation amount (=cell power generation current) when the solar cell 1 is placed horizontally under the same illuminance as above and irradiated with light in a direction perpendicular to the photoelectric power generation region. The ratio of the above-mentioned obtained current obtained by the product of the exposure ratio of the wound photovoltaic power generation region can be expressed by the following formula.

Light receiving efficiency = obtained current ÷ {battery generated current × exposure ratio}

= Obtained current ÷ exposed battery to convert power generation current...①

Using FIG. 9 , it can be judged that the obtained current of the single-cell complete solar cell used in this example can be obtained approximately in proportion to the outer diameter. This means that the completed solar cell of this embodiment is a single cell, and even if a part of the photovoltaic power generation region of the completed solar cell is covered, it can generate power in an amount corresponding to the light irradiation region. This point is the biggest difference from the case where a plurality of solar cells are arranged in series in the circumferential direction as in the conventional example shown in Patent Document 1 above.

In addition, it can be seen from FIG. 9 that the light receiving efficiency is about 22% when the outer diameter is φ29.5mm, and the light receiving efficiency is about 20% when the outer diameter is φ13mm.

Next, the relationship between the power consumption of the meter used in this embodiment and the power generation of the completed solar cell will be described.

(1) Meter power consumption

The specification of the watch used in the description of this embodiment is a three-hand analog watch with a calendar, and the power consumption of the watch is 0.53 μA.

Therefore, the power consumption required for one day needle movement = 12.7μA·hr...②

(2) The power generation performance of the completed solar cell in the state of being housed in the case of the dimensions shown in this embodiment

Complete solar cell power generation current = 60μA

(Conditions: illuminance 500lux, operating voltage 0.45V, completion of horizontal placement of solar cells)

In the electronic watch with a solar cell of this embodiment, the open circuit voltage Voc of the completed solar cell of the watch using a single solar cell is 0.6V. In order to charge a Li secondary battery with a rated voltage of 1.35V, it is necessary to increase the generated voltage. pressure.

If the specifications of the booster system are set at 3 times the boost ratio and 90% boost efficiency, the power generation of the completion table under the above-mentioned average light conditions of each day can be calculated by the following formula.

Power Generation = Irradiation Time x Exposed Battery Body Converted Power Generation Current x Light Receiving Efficiency x Boost Efficiency ÷

Boost ratio...③

Then, if formula ① is substituted into ③, it becomes

Power generation = irradiation time × obtained current × boost efficiency ÷ boost ratio...④

Here, if the power generation of the completed watch under the average irradiation conditions per day in the formula ④ is more than the power consumption required for hand movement in the formula ②, the table is established.

That is, the table power consumption × 24hr ≤ irradiation time × obtained current × boost efficiency ÷ boost ratio...⑤ can be established.

Therefore, assuming that the average illumination condition of each day is 500lux and the irradiation time is 4hr, the minimum obtained current obtained from formula ⑤ is as follows:

Minimum obtained current = meter power consumption × 24hr × boost ratio ÷ irradiation time ÷ boost efficiency

＝0.53μA×24hr×3÷4hr÷90％

＝10.6μA

Next, from the graph of the obtained current with respect to the external diameter in FIG. 9 , it can be obtained that the external diameter with respect to the obtained current of 10.6 μA is about 25 mm. That is, it was confirmed that in order to obtain a sufficient amount of power generation for the watch to function, it is sufficient to set the outer diameter to 25 mm or more.

In addition, in the women's watch shown in FIG. 8 , it is shown that the outer diameter can be set up to 24mm in the watch structure, but the watch movement used in the description of this embodiment can be generated by the power consumption relative to the watch. Performance sets the outside diameter above 25mm.

If the present invention is adopted in this way, an electronic watch with a solar cell having an outer diameter of 25 mm or more can be driven by using the elongated strip-shaped solar cell 2 with a length of about 96.8 mm, a width of 2.4 mm, and a thickness of about 0.15 mm. Of course, if the power consumption of the watch movement continues to be reduced, or the light-receiving efficiency of the collar 10 is improved, and the power generation performance of the solar cell is improved, it is also possible to drive an electronic watch with a solar cell with an outer diameter of 24 mm or less.

The light receiving efficiency can also be determined by the color of the code disc. That is, if a white or bright-colored dial that is easy to reflect light on the dial is used, the light receiving efficiency will increase, and when the color of the dial is black, the light receiving efficiency will be low, because black and white are two colors. , The light-receiving efficiency of white is doubled, so if you use a bright-colored dial, you can get a watch with a smaller outer diameter.

Furthermore, in the description of the embodiment of the present invention, a strip-shaped single solar cell is used, but a solar cell such as a two-stage cell in which the solar cell 2 is divided into upper and lower segments in the longitudinal direction may also be used.

Fig. 10 and Fig. 11 are other embodiments of the present invention, showing the example of the table that is used to use the table movement of the present invention, and the shape design of the heart code disc is oval and rounded rectangular. Same as the above-mentioned embodiment, the shape of the middle hoop 9 is set as an ellipse or the like. The completed solar cell 1 is disposed in the unillustrated step portion of the middle ring 9, and at the same time, the watch movement 5 is embedded in the middle ring 9, showing the state in which the solar battery 1 and the watch movement 5 are connected. In this way, it can also be applied to a solar power meter having an outer diameter shape other than a circle.

However, when the shape of the outer diameter and the circumference of the shape depending on the size of the outer diameter are longer than the solar cell, the solar cell is in an open shape. However, even in this case, the gap can be made inconspicuous from the outside of the watch by harmonizing the color tone of the center band and the solar cell.

Fig. 12 to Fig. 16 are other embodiments of the present invention, showing an example of a watch with small-radius corners in the shape of a dial having a rectangular shape, a barrel shape, or the like for use with the watch movement of the present invention.

As we all know, the shape of the dial of the watch corresponds to the size of the casing, and it can be not only circular, but also various shapes such as rectangle and barrel. On the other hand, if amorphous silicon used as a photovoltaic element of a solar cell is bent with a small radius, for example, 500 μm or less, cracks will occur in the amorphous silicon. Therefore, if the solar cells with curved corners such as rectangles and barrels are combined, the role of amorphous silicon as a photovoltaic power generation component will no longer be exerted. Therefore, a structure in which solar cells are vertically arranged with respect to the dial cannot be adopted in an electronic watch having a dial with small radius corners such as a rectangle or a barrel shape.

The electronic watch with a solar cell of the present embodiment solves the above-mentioned problems, and can be formed corresponding to a wide watch design.

The dial 7 of the electronic watch with a solar cell shown in FIG. 12 is a rectangular example whose outer peripheral shape is a rectangle. The shape of the character code disc 7 has a plurality of sides 7a, 7b, 7c, 7d forming the main periphery, and is used to connect the sides 7d and 7a, 7a and 7b, 7b and 7c, 7c and Corners (intersections) 7e, 7f, 7g and 7h of 7d.

The completed solar cell 1 has a plurality of photovoltaic power generation parts (photoelectric power generation regions) 1a, 1b, 1c, and 1d arranged outside the corners 7e, 7f, 7g, and 7h of the dial 7 . The plurality of photovoltaic power generation units 1a, 1b, 1c, and 1d are arranged in series and form a parallel strip shape. The completed solar cell 1 is arranged along the plurality of sides 7 a , 7 b , 7 c , and 7 d of the dial 7 as indicated by the dotted line.

Fig. 13 is a sectional view of A-A of Fig. 12, as in the existing electronic watch, the movement 5 of the electronic watch is disposed under the code disc 7, 6 is the shell, and 9 is the middle hoop for holding the movement 5 of the electronic watch . The movement 5 is supported by the case 6 by disposing the center ring 9 between the outer side of the movement 5 and the case 6 .

When the solar cell 1 is completed, its light-receiving surface 1r is erected on the retaining ring portion 9a of the middle ring 9 to become the inner peripheral side of the dial, as shown by the dotted line in FIG. The strip edges 7 a , 7 b , 7 c , and 7 d are arranged in a circular shape substantially perpendicular to the dial 7 . The backing ring 10 is disposed on the light-receiving surface 1r side of the completed solar cell 1, so as to fix the ribbon-shaped solar cell well and make the electronic watch have a good appearance. The backing ring 10 is made of a light-transmitting material capable of incident light, and like the completed solar cell 1 , is disposed in an annular shape with respect to the dial 7 .

As mentioned above, if the completed solar cell 1 is arranged approximately vertically relative to the dial 7 along the sides 7a, 7b, 7c, 7d of the dial 7, the strips in the D, E, and F portions shown in FIG. 12 To complete the solar cell 1, the parts corresponding to the rectangular corners 7e, 7f, 7h of the dial 7 are bent, so that the solar cell 1 is fixed between the retaining ring portion 9a of the middle hoop 9 and the back ring 10.

Next, the structure of the ribbon-shaped completed solar cell 1 will be described with reference to FIGS. 14 to 16 . In addition, portions of the completed solar cell 1 corresponding to portions D, E, and F shown in FIG. 12 are shown as portions d, e, and f in the developed view of FIG. 14 .

After the solar cell 1 is completed, an amorphous silicon layer constituting a photovoltaic power generation part is mounted on the circuit board 2, and the amorphous silicon layer 21 is a photovoltaic power generation part for converting light energy into electric energy. In this embodiment, a plastic film board is used as the circuit board 2 , and a metal foil 22 such as aluminum is formed on the film circuit board 2 . This metal foil 22 serves as an electrode on the anode side from which electric power generated by the above-mentioned amorphous silicon layer 21 is taken out.

Parts d, e, and f of the ribbon-shaped completed solar cell 1 shown in FIG. 14 have the same cross-sectional structure.

Here, the B-B cross-sectional view of the cross-sectional structure of the portion d is shown in FIG. 15 , and the C-C cross-sectional view is shown in FIG. 16 . In FIG. 16 , the metal foil 22 connects the same poles of the amorphous silicon layer 21d on the right side of the figure and the amorphous silicon layer 21c on the left side. In FIG. 15 , the amorphous silicon layers 21c and 21d on both sides are not connected Instead, an independent pattern is formed, that is, the connection electrode 22a described later.

The transparent conductive thin film 23 is formed on the upper surface of the amorphous silicon layer 21, and forms the light-incident side of the amorphous silicon layer 21, and serves as a cathode-side electrode for generating electric power.

The insulating member 24 is a member for preventing a short circuit between the upper and lower electrodes of the amorphous silicon layer 21 , the transparent conductive film 23 , and the metal foil 22 .

The conductive member 25 electrically connects the transparent conductive film 23 formed on the right amorphous silicon layer 21d, the transparent conductive film 23 formed on the left amorphous silicon layer 21c, and the connection electrode 22a. Then, the amorphous silicon layer 21d on the right is electrically connected to the amorphous silicon layer 21c on the left.

The protective film 26 is a transparent insulating material covering the surface of the solar cell 1 .

As described above, the transparent conductive thin film 23 serves as a cathode-side electrode disposed on the upper surfaces of the left and right amorphous silicon layers 21c and 21d, and is electrically connected through the connection electrode 22a and the conductive member 25 (FIG. 15). In addition, the anode-side electrodes under the left and right amorphous silicon layers 21c and 21d are electrically connected through the metal thin film 22 (FIG. 16). Similarly, the respective amorphous silicon layers 21a and 21d, 21d and 21c shown in FIG. 14 are connected, and the respective amorphous silicon layers 21a, 21b, 21c, and 21d are connected in parallel.

On the right side end of the completed solar cell 1, a connection terminal 4 for connecting the generated power of the four amorphous silicon 21a, 21b, 21c, 21d to the movement 5 of the electronic watch is crimped.

When the completed solar cell 1 is housed in the case 6 of the electronic watch with solar cell as described above, part d shown in FIG. 14 is installed and housed in part D shown in FIG. Included in Parts E and F.

The amorphous silicon layer 21 is very brittle, and there is no problem when the bending radius is large, but if the bending radius is small, it may not be able to withstand the bending and cracks may occur. The occurrence of the cracks is the main reason for the impairment of the power generation function due to short circuit between the metal electrode 22 and the transparent conductive film 23 constituting the upper and lower electrodes, or short circuit due to water ingress.

However, if the completed solar cell of the present embodiment is adopted, since a small-radius structure resistant to bending is formed, no cracks will occur at the parts corresponding to the corners 7e, 7f, 7g, and 7h of the dial 7, ensuring The electrical connection of each amorphous silicon layer 21 is realized.

In addition, in the embodiment shown in FIG. 14, an electronic watch with a solar cell in which four amorphous silicon layers are connected in parallel on one completed solar cell is constituted, but the embodiment shown in FIG. 17 may also be used.

That is, a plurality of strip-shaped amorphous silicon layers 21 are arranged in the width direction of the circuit board 2 to constitute a solar cell module in which the plurality of amorphous silicon layers 21 are connected in series. And, the quantity of this solar cell assembly is set to the number corresponding to the number that only changes with character code disc 7 (in Fig. 17, be four solar cell assemblies 21a', 21b corresponding to four sides 7a, 7b, 7c, 7d ', 21c', 21d'), these solar cell assemblies are respectively arranged along the sides of the code plate 7, and are approximately vertically arranged relative to the code plate. On the other hand, flexible conductive members 27 are arranged at portions corresponding to corner portions 7 a , 7 b , 7 c , and 7 d of the dial 7 . In addition, the above-mentioned multiple solar battery components are connected in parallel to form a complete solar battery.

Industrial applicability

According to the present invention, by arranging the solar cell on the lining part, it is possible to provide an electronic watch with a solar cell using a metal dial; furthermore, it is possible to provide a watch movement that can use a common watch movement regardless of the size of the outer diameter and complete the solar cell. Digital watch with solar battery.

Claims (8)

1. electronic watch with solar cell, be provided with watch movement, take in this watch movement watchcase, be used for above-mentioned watch movement is taken in hoop, solar cell and the lettered dial that remains in the above-mentioned watchcase, and above-mentioned solar cell is approximate vertical configuration with respect to above-mentioned lettered dial; It is characterized in that above-mentioned solar cell is disposed at the place, solar cell location division that is arranged in the above-mentioned middle hoop.

2, the electronic watch of band solar cell as claimed in claim 1 is characterized in that said solar cell is the solar cell that is formed at the elongated, belt-shaped on the flexible electric circuit board.

3, the electronic watch of band solar cell as claimed in claim 1 or 2 is characterized in that the positive and negative electrode with solar cell is disposed at the end, the same side of above-mentioned solar cell.

4, the electronic watch of band solar cell as claimed in claim 1 or 2 is characterized in that indivedual manufacturings, engages the extraction electrode and the above-mentioned solar cell of the generation power be used to take out above-mentioned solar cell.

5, the electronic watch of band solar cell as claimed in claim 1 is characterized in that said lettered dial is the lettered dial with bight of intersection point between many limits being used to be connected to form main peripheral shape and this many limits and the limit; Said solar cell has along many limits of above-mentioned lettered dial and a plurality of smooth Power Generation Section that disposes with respect to above-mentioned lettered dial approximate vertical, and these a plurality of smooth Power Generation Sections are in parallel respectively.

6, the electronic watch of band solar cell as claimed in claim 5 is characterized in that said smooth Power Generation Section is a plurality of amorphous silicon layers of configuration on the Width of circuit board, and connects and constitute.

7,, it is characterized in that the peripheral shape of the above-mentioned lettered dial that formed by above-mentioned many limits and bight is a rectangle as the electronic watch of claim 5 or 6 described band solar cells.

8,, it is characterized in that the peripheral shape of the above-mentioned lettered dial that formed by above-mentioned many limits and bight is barrel-shaped as the electronic watch of claim 5 or 6 described band solar cells.

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